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Old 07-07-2010, 14:16   #1 (permalink)
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04 Navigator knock on start up & tranny shutter

i have a 04 navi with 95k miles, just started getting a knocking sound when i first start it, not every time, but just every once in a while, and it not just when cold, it last for like 3-6 secs and then purrs like a kitten.. i have read several threads and see all kinds of different ideas but mostly on the earlier navi, not the 04's, so any ideas to fix is great. oil level good, fixing to do oil change, 5w/20 motorcraft and filter.

Also am starting to get a slight shimmy from the tranny i believe when it goes to shift gears, maybe only does it like 1 time on a outing. other then that shifts great no slipping. should i do a tranny flush or fluid change, or dont mess with it and take my chances since it has 95k miles. tranny fluid is good level when warm.

I have not had truck that long, so dont know what the previous owners had done or not had done. great truck so far, just want to get those things figured out soon.
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Old 07-07-2010, 16:36   #2 (permalink)
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Re: 04 Navigator knock on start up & tranny shutter

Take it to an Autozone to see what codes they pull. There's no charge for that. Hard to say on the knock without being able to hear it.
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Old 07-07-2010, 17:22   #3 (permalink)
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Re: 04 Navigator knock on start up & tranny shutter

No Codes...
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Old 07-07-2010, 19:54   #4 (permalink)
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Re: 04 Navigator knock on start up & tranny shutter

A trans service is a good idea. Make sure to use Mercon V. Usually a service won't fix a transmission that has a problem though.
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